EP0625383B1 - Line to produce strip and/or sheet - Google Patents

Line to produce strip and/or sheet Download PDF

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Publication number
EP0625383B1
EP0625383B1 EP94105763A EP94105763A EP0625383B1 EP 0625383 B1 EP0625383 B1 EP 0625383B1 EP 94105763 A EP94105763 A EP 94105763A EP 94105763 A EP94105763 A EP 94105763A EP 0625383 B1 EP0625383 B1 EP 0625383B1
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EP
European Patent Office
Prior art keywords
line
furnace
slabs
slab
hereinbefore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Revoked
Application number
EP94105763A
Other languages
German (de)
French (fr)
Other versions
EP0625383A1 (en
Inventor
Giovanni Coassin
Fausto Drigani
Bruno Di Giusto
Pietro Morasca
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Danieli and C Officine Meccaniche SpA
Original Assignee
Danieli and C Officine Meccaniche SpA
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Priority claimed from ITUD930086A external-priority patent/IT1262118B/en
Priority claimed from ITUD930215A external-priority patent/IT1262224B/en
Application filed by Danieli and C Officine Meccaniche SpA filed Critical Danieli and C Officine Meccaniche SpA
Publication of EP0625383A1 publication Critical patent/EP0625383A1/en
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Anticipated expiration legal-status Critical
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/46—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting
    • B21B1/466—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling metal immediately subsequent to continuous casting in a non-continuous process, i.e. the cast being cut before rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
    • B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/30—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process
    • B21B1/32—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work
    • B21B1/34—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a non-continuous process in reversing single stand mills, e.g. with intermediate storage reels for accumulating work by hot-rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B15/0007—Cutting or shearing the product
    • B21B2015/0014—Cutting or shearing the product transversely to the rolling direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/004—Heating the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
    • B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/34—Methods of heating
    • C21D1/42—Induction heating
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4998—Combined manufacture including applying or shaping of fluent material
    • Y10T29/49988—Metal casting
    • Y10T29/49991—Combined with rolling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/51—Plural diverse manufacturing apparatus including means for metal shaping or assembling
    • Y10T29/5184—Casting and working

Definitions

  • This invention concerns a line to produce strip and/or sheet, as set forth in the main claim.
  • the production line according to the invention is suitable for the balancing of the various components and for optimising the yield of a production plant for the rolling in line of strip and/or sheet, starting from the continuous casting of thin or medium slabs, and also for ensuring a high level of output.
  • thin slabs slabs with a width of 700 to 2500 mm. and with a thickness of 30 to 60 mm.
  • medium slabs slabs with a width of 700 to 2500 mm. and with a thickness of 60 to 130 mm.
  • Rolling lines to produce thin and medium strip or sheet are disclosed in the state of the art; the types usually employed in the state of the art are substantially two in number.
  • a first type of line arranges that the continuously cast slab, after being sheared to size, is sent into a temperature-restoration furnace of a combustion type.
  • This method entails the use of furnaces of great sizes up to 150 metres or more together with problems linked to the costs of investment, the power employed for heating, maintenance of the plant and also with problems connected with an imperfect productivity of the plant.
  • the segment of slab at the outlet of the combustion furnace is accelerated and then sent for rolling.
  • a second type of plant such as those of EP-A-0107991 or US-A-5,156,800 for instance, provides a quick-heating assembly, an induction furnace for example, located downstream of the continuous casting plant and of the shearing-to-size assembly and followed by a furnace which makes homogeneous and equal the temperature of the slab.
  • the slab is passes at a low speed through the induction furnace so as to limit the requirement of power and is sent thereafter to a rolling train located at the outlet of the quick-heating assembly.
  • the rolling train works at a low speed with problems of thermal stress of the rolling rolls.
  • JP-A-60-18201 provides a rolling line for normal and medium slabs, and not for thin slabs, where, downstream of the casting machine, there is a first quick-heating assembly (11a) upstream of the shears and a second quick-heating assembly (11b) downstream of the shears.
  • the slab is made to move in air as, given its section size, the loss of heat at the narrow sides is not such that the temperature is lowered below the lower threshold values, below which the slab cannot be accepted for rolling.
  • EP-A-0.499.851 provides a rolling line for thin slabs where there are two insulated tunnels followed by two tunnels to equalize the temperature, followed by a descaling unit, a vertical mill stand, a flying shears assembly and a rolling train.
  • US-A-4,658,882 provides (Fig.12) a quick-heating assembly, a breaker scale (no better defined than this), a roughing stand, a heating furnace and another breaker scale followed by the rolling train.
  • This invention which works normal and medium slabs, does not consider in the least the problems found in working thin slabs, problems relating to the lowering of the temperature, the losses of heat at the narrow sides, surface cracks, and the uneven growth of the scale.
  • a purpose of the invention is to set up a line to produce sheet or strip which enables an excellent balance between all the components to be achieved, does not create imbalances and/or oversizing as between the operational assemblies involved and reduces the working times.
  • Another purpose of the invention is to provide a production line of a restricted size which, in particular, enables the length of the temperature-restoration furnace to be reduced.
  • a further purpose is to reduce the number and sizes of the rolling mill stands.
  • Yet another purpose of the invention is to reduce the power requirement in question.
  • Still another purpose of the invention is to make possible the doubling of the casting line without thereby entailing considerable work, high costs and a long downtime of the rolling train.
  • the production line according to the invention includes downstream of the continuous casting machine an assembly for shearing to size which shears the slab into segments of a required length, which is typically 40-50 metres.
  • the initial thickness of the slab leaving the casting machine is substantially between 30 and 150 mm.
  • the invention arranges that a pendulous mechanical shears is used as a shearing assembly for slabs between 30 and 80 mm. thick, whereas for greater thicknesses the shearing assembly consists of an assembly of oxygen cutting lances.
  • An induction furnace suitable to restore the temperature of the slab quickly is included immediately downstream of the shearing assembly.
  • the slab at the inlet of the induction furnace has a speed of feed corresponding to the casting speed, typically about 3 to 6 metres per minute.
  • the induction furnace has substantially the task of heating the surface and edges of the slab and in that case is followed by a heating furnace.
  • the induction furnace has the task also of heating the slab in depth and may be designed to work with different frequencies related specifically to the surface and core of of the slab.
  • the induction furnace comprises a plurality of modules, of which at least one heats the surface and edges and at least one heats the slab in depth.
  • a tunnel furnace is included downstream of the induction furnace and may have either the task of preventing any fall in the temperature of the slab and of keeping the temperature at the values of its departure from the induction furnace or the task of heating the slab to the desired temperature.
  • the segment of slab is accelerated by increasing the speed of the roller conveyors to reach a speed of 40 to 60 metres per minute or more.
  • the roller conveyors can be inside the tunnel furnace or be outside and be associated with insulating hoods possibly equipped with heating means.
  • the increase of speed on the roller conveyors enables the trailing end of the sheared segment of slab to be distanced from the leading end of the next slab being cast.
  • the segment of slab undergoes a descaling process downstream of the tunnel furnace on its path to the rolling train.
  • a descaling assembly is included upstream of the tunnel furnace and immediately downstream of the induction furnace so as to make maximum use of the effect of cracking of the scale caused by the heating of the surface of the slab.
  • the descaling assembly is advantageously of a type with movable nozzles to reduce to a minimum the lowering of the temperature of the slab passing at a low speed.
  • the descaling assembly may also be governed advantageously by the signal of the shearing of the slab, for instance by following the gradient of acceleration of the conveyor rollers of the furnaces and by thus optimising its descaling action.
  • the descaling assembly is of a type with stationary nozzles.
  • the descaling assembly with rotary nozzles is located advantageously downstream of the induction furnace, whereas the descaling assembly with stationary nozzles is positioned upstream of the rolling train and downstream of the tunnel furnace, whether the latter be a heating furnace or a temperature maintaining furnace.
  • a descaling assembly which is advantageously, but not necessarily, of a type with movable nozzles, is included within the secondary cooling chamber of the casting plant or immediately outside the mould.
  • a slab storage and traversing furnace having also the task of heating is comprised downstream of the induction furnace and descaling assembly.
  • this storage and traversing furnace includes means to displace slabs in a direction crosswise to their normal direction of feed.
  • the storage and traversing furnace may have the task of connecting together a continuous casting machine and a rolling train which are not in the same line as each other.
  • the storage and traversing furnace may also act as a buffer store and emergency store when any accidents, obstacles, operations of maintenance or replacement of rolls halt the rolling train while the casting machine continues working.
  • the storage and traversing furnace can be associated with stores holding a cold charge and/or special products to be forwarded for rolling.
  • a further task of the storage and traversing furnace can be the alternative connection of two continuous casting machines with one single rolling train.
  • the storage and traversing furnace comprises also at least one feeder roller conveyor associated with the casting machine and also at least one removal roller conveyor associated with the rolling train.
  • the feeder and removal roller conveyors are outside the storage and traversing furnace and cooperate therewith transversely for the transfer of slabs thereinto and therefrom.
  • the feeder and removal roller conveyors are inside the furnace and cooperate lengthwise with the furnace for the entry of slabs.
  • the storage and traversing furnace comprises a zone in which it performs the task of a heating furnace.
  • This zone is advantageously the zone cooperating with the removal roller conveyor.
  • the rolling assembly may be of a reversible type with a double rolling mill stand, the rolling rolls being adjustable according to the reduction of thickness desired.
  • the reversible rolling assembly When strip is being produced, the reversible rolling assembly cooperates upstream and downstream with a winding/unwinding means on which the strip is respectively wound and unwound on leaving the rolling mill stands so as to enable the direction of feed to be inverted with a saving of the space occupied.
  • the winding/unwinding means may be of a type providing heating for the wound package.
  • the strip or sheet is sent to a cooling assembly and is then discharged from the line.
  • a unit to form packages is included downstream of the cooling assembly.
  • the rolling assembly is of a continuous type and consists of 3 to 7 rolling mill stands arranged in line.
  • the reference number 10 in the attached figures denotes a line to produce rolled products according to the invention.
  • Fig.1 shows in particular a line 10 suitable to produce strip, whereas Figs.2 and 4 shows the line 10 as adapted to produce thin sheet.
  • a thin slab 11 coming from a continuous casting machine 12 is sent to a shearing assembly 13 consisting, for instance, of a pendulous shears for shearing to size or a shearing assembly of oxygen cutting lances, depending on the thickness of the cast slab 11.
  • the shearing assembly 13 is of a known type and is synchronised with the casting speed.
  • the continuous casting machine 12 includes a usual ladle-overturning unit 25 and tundishes 26 of a replaceable type of the state of the art.
  • the shearing assembly 13 shears the thin slab 11 into segments of a desired length related to the weight of the finished coil, but typically segments 40 to 50 metres long.
  • the shearing assembly 13 is also prepared for emergency scrap-shearing into short segments of a length between 200 and 450 mm. and for discharge of the same or for shearing to size in short segments of 3 to 4 metres during an emergency cycle in synchronisation with an emergency speed of the casting machine 12.
  • the segments are fed at the casting speed, which is typically a speed V1 of about 3 to 6 metres per minute, within an induction-type furnace 14.
  • the induction furnace 14 typically has a length of 3 to 12 metres.
  • the induction furnace 14 employs also powers between about 3 and 8 MW for the slowest speeds of feed but may reach 16 to 18 MW for speeds of feed of about 6 metres per minute.
  • the induction furnace 14 has the task substantially of heating the surface and edges of the slab 11.
  • an induction furnace 14 which has a length at least equal to that of the segment of slab 11 sheared to size and has the task of heating the slab 11 in depth.
  • the induction furnace 14 consists of three modules positioned in sequence and consisting in this case of a stationary segment 14a, a traversable segment 14b and another stationary segment 14c for heating the surface and edges.
  • the traversable segment 14b may be located, for instance, on a bogie cooperating with rails 23.
  • a descaling assembly 115 is included at the outlet of the last segment 14c of the induction furnace 14 heating the surface and edges and cooperates with the slab 11 being fed at a low speed.
  • the descaling assembly 115 is advantageously of a type with rotary nozzles providing a high pressure of impact of about 7 to 9 kgs/cm 2 and a low overall rate of flow of water of about 200-500 litres per minute so as to reduce to a minimum the drop in temperature of the slab 11 passing through at a low speed between 2.8 and 6 metres per minute.
  • the traversable segment 14b of the induction furnace 14 is installed on the same axis as the casting line and rolling train 17-117.
  • the traversable segment 14b is removed from the production line 10; to be more exact, in this case, when the signal has been given that the last production shearing has been performed and that the trailing end of the slab has entered the descaling assembly 115, the traversable segment 14b of the induction furnace 14 is removed from the line and replaced by a transfer means 22.
  • This transfer means 22 is suitable to collect the short slabs of 3-4 metres prepared by the shearing assembly 13 during the emergency cycle.
  • a tunnel furnace 16 is included downstream of the induction furnace 14 and may have the function of a heating furnace when the induction furnace 14 has only the task of heating the surface and edges.
  • the tunnel furnace 16 may have the function of a temperature maintaining furnace when it cooperates with an induction furnace 14 that heats the surface of the slab 11 and also heats the slab 11 in depth.
  • the tunnel furnace 16 possibly heated and/or insulated, arranges to prevent any drop in temperature of the material and maintains and keeps equal that temperature at about the values at the outlet of the induction furnace 14.
  • That temperature maintaining furnace or tunnel 16 is so dimensioned that it contains the whole length of the segment of slab 11.
  • the segment of slab 11 is accelerated up to a speed V2 of about 60 metres a minute, undergoes descaling by the high-speed descaling assembly 15 and is sent to the rolling train 17-117.
  • At least one emergency shears 24 advantageously of a hydraulic type is located between the tunnel furnace 16 and the descaling assembly 15.
  • the high-speed descaling assembly 15 is advantageously of a type with static nozzles and obtains a pressure of impact of about 4.5 to 8.5 kgs/cm 2 .
  • descaling assemblies 215 are included in direct cooperation with the secondary cooling chamber immediately downstream of the mould and possibly in cooperation with the base of the mould itself.
  • the variant shown in Figs.6 and 7 includes a storage and traversing furnace 27 downstream of the induction furnace 14.
  • This storage and traversing furnace 27 cooperates with at least one feeder roller conveyor 28 associated with the casting machine 12 and at least one removal roller conveyor 29 associated with the rolling train 17.
  • the storage and traversing furnace 27 has the task of connecting a casting machine 12 to a rolling train 17 which is not in-line with the casting machine 12.
  • the storage and traversing furnace 27 has the further function of a buffer store to collect segments of slab 11 whenever the rolling train 17-117 is halted owing to accidents, obstacles, operations of maintenance or replacement of rolls, etc.
  • the storage and traversing furnace 27 includes means to take slabs 11 from the feeder roller conveyor 28, transfer those slabs 11 crosswise to the normal direction of feed of the slabs 11 and place those slabs 11 on the removal roller conveyor 29.
  • These means to handle the slabs 11 within the storage and traversing furnace 27 are suitable to displace the slabs 11 transversely to the normal direction of feed of the slabs and are generally of a step-by-step known type.
  • these handling means associated with the storage and traversing furnace 27 advantageously work in modest steps of the order of 500-600 mm. in displacing the slabs 11 within the storage and traversing furnace 27.
  • These handling means can also work with a greater step substantially equal to the width of the slab 11 in transferring the slab 11 from the feeder roller conveyor 28 and to the removal roller conveyor 29, the purpose of this being to carry out with one single displacement the taking of the slab 11 from the feeder roller conveyor 28 and the delivery of the same 11 to the removal roller conveyor 29.
  • the storage and traversing furnace 27 includes a first zone 127a associated with the feeder roller conveyor 28 and acting as buffer store and/or emergency store for the rolling train 17 and a second zone 127b associated with the removal roller conveyor 29 and used for heating the slabs which have to be forwarded for the rolling process.
  • the storage and traversing furnace 27 cooperates with stores 30 which hold a cold charge and/or special products and which are associated with roller conveyors 31 that deliver into the furnace; these stores 30 may also act as emergency stores.
  • These stores 30 for a cold charge and/or special products may cooperate with units that perform conditioning, cropping of the leading and/or trailing ends, re-finishing and quick heating.
  • the storage and traversing furnace 27 has the task of connecting two casting lines 33a and 33b respectively to one single rolling train 117.
  • the storage and traversing furnace 27 is associated directly with a tunnel 116, which maintains the temperature of the slabs, possibly heats them and connects the side-by-side roller conveyors associated with the two casting lines 33a and 33b.
  • Each casting line 33a and 33b includes its relative induction furnace 14a and 14b and descaling assembly 15a and 15b.
  • the tunnel 116 includes transfer means 32 to transfer the slabs from one casting line 33 to the other.
  • This lay-out makes possible the alternative working of the two casting lines 33, which can feed the storage and traversing furnace 27 substantially continuously.
  • the storage and traversing furnace 27 contains the feeder 128 and removal 129 roller conveyors within the furnace 27.
  • the slabs 11 are fed into the furnace 27 along their normal axis of feed.
  • the rolling assembly 17 is of a reversible two-stand type.
  • the first pass in the first rolling mill stand 17a brings the slab 11a to a thickness of about 25 mm.; the next pass in the second stand 17b reduces that thickness of slab 11b to about 14 mm.
  • the strip leaving the second stand 17b is wound in a roll on a second winding/unwinding unit 18 located downstream of the second stand 17b.
  • This second pass through the second stand 17b brings the thickness of the slab 11c to a value of about 9 mm., while the pass through the first stand 17a reduces this thickness of slab 11d to a value of about 5 mm.
  • the first winding/unwinding unit 18a located upstream of the first rolling mill stand 17a performs winding of the strip.
  • winding/unwinding units 18a-18b cooperate with drawing units 21.
  • the winding/unwinding units 18 are excluded from the line and the whole length of the sheet is passed from one side to the other side of the rolling assembly 17.
  • this third pass through the first stand 17a reduces the thickness of the strip/sheet 11e to about 3 mm. and the third pass through the second stand 17b brings the strip/sheet to the desired finished value of thickness of about 1.5 mm.
  • strip/sheet 111 is sent to a cooling assembly 19 and is then discharged from the line 10.
  • a strip coiling unit 20 to form coiled packages is included downstream of the cooling assembly 19.
  • the rolling assembly 117 is of a continuous type and comprises five rolling mill stands positioned in line.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Metal Rolling (AREA)
  • Vehicle Step Arrangements And Article Storage (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Chemically Coating (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

Line to produce strip and/or sheet or a combined line for strip/sheet, starting from at least one plant for the continuous casting of thin or medium slabs, the continuous casting plant comprising in sequence a continuous casting machine (12), at least one assembly (13) for shearing to size, a temperature restoration system, a rolling train (17;117) and a possible assembly (19) for the cooling of strip/sheet (111), means to accelerate the speed of feed of the slabs (11) being included downstream of the assembly (13) for shearing to size, the temperature-restoration system comprising an induction furnace (14) with at least one working frequency to heat the surface and edges of the slabs (11), the induction furnace (14) being followed by a low-speed descaling means (115) and by a tunnel furnace (16), an emergency shears (24) and high-speed descaling means (15) being included between the tunnel furnace (16) and the rolling train (17;117). <IMAGE>

Description

This invention concerns a line to produce strip and/or sheet, as set forth in the main claim.
To be more exact, the production line according to the invention is suitable for the balancing of the various components and for optimising the yield of a production plant for the rolling in line of strip and/or sheet, starting from the continuous casting of thin or medium slabs, and also for ensuring a high level of output.
By thin slabs are meant slabs with a width of 700 to 2500 mm. and with a thickness of 30 to 60 mm., whereas by medium slabs are meant slabs with a width of 700 to 2500 mm. and with a thickness of 60 to 130 mm.
Rolling lines to produce thin and medium strip or sheet are disclosed in the state of the art; the types usually employed in the state of the art are substantially two in number.
A first type of line arranges that the continuously cast slab, after being sheared to size, is sent into a temperature-restoration furnace of a combustion type.
The slab passing through this temperature-restoration furnace at a low speed has to stay therewithin until the temperature of the material has been brought to the necessary value most suitable for the subsequent processes.
This method entails the use of furnaces of great sizes up to 150 metres or more together with problems linked to the costs of investment, the power employed for heating, maintenance of the plant and also with problems connected with an imperfect productivity of the plant.
The segment of slab at the outlet of the combustion furnace is accelerated and then sent for rolling.
A second type of plant, such as those of EP-A-0107991 or US-A-5,156,800 for instance, provides a quick-heating assembly, an induction furnace for example, located downstream of the continuous casting plant and of the shearing-to-size assembly and followed by a furnace which makes homogeneous and equal the temperature of the slab.
The slab is passes at a low speed through the induction furnace so as to limit the requirement of power and is sent thereafter to a rolling train located at the outlet of the quick-heating assembly.
The rolling train works at a low speed with problems of thermal stress of the rolling rolls.
This requires the use of a rolling train oversized as compared to the other components of the plant.
This entails also an imperfect exploitation of the working assemblies of the production line.
JP-A-60-18201 provides a rolling line for normal and medium slabs, and not for thin slabs, where, downstream of the casting machine, there is a first quick-heating assembly (11a) upstream of the shears and a second quick-heating assembly (11b) downstream of the shears.
After the second quick-heating assembly (11b), where the heating can be performed by induction or by burners, the slab is made to move in air as, given its section size, the loss of heat at the narrow sides is not such that the temperature is lowered below the lower threshold values, below which the slab cannot be accepted for rolling.
EP-A-0.499.851 provides a rolling line for thin slabs where there are two insulated tunnels followed by two tunnels to equalize the temperature, followed by a descaling unit, a vertical mill stand, a flying shears assembly and a rolling train.
US-A-4,658,882 provides (Fig.12) a quick-heating assembly, a breaker scale (no better defined than this), a roughing stand, a heating furnace and another breaker scale followed by the rolling train.
This invention, which works normal and medium slabs, does not consider in the least the problems found in working thin slabs, problems relating to the lowering of the temperature, the losses of heat at the narrow sides, surface cracks, and the uneven growth of the scale.
The present applicants have designed, tested and embodied this invention to overcome the shortcomings of the state of the art and to achieve further advantages.
This invention is set forth and characterised in the main claim, while the dependent claims describe variants of the idea of the main embodiment.
A purpose of the invention is to set up a line to produce sheet or strip which enables an excellent balance between all the components to be achieved, does not create imbalances and/or oversizing as between the operational assemblies involved and reduces the working times.
Another purpose of the invention is to provide a production line of a restricted size which, in particular, enables the length of the temperature-restoration furnace to be reduced.
A further purpose is to reduce the number and sizes of the rolling mill stands.
Yet another purpose of the invention is to reduce the power requirement in question.
Still another purpose of the invention is to make possible the doubling of the casting line without thereby entailing considerable work, high costs and a long downtime of the rolling train.
The production line according to the invention includes downstream of the continuous casting machine an assembly for shearing to size which shears the slab into segments of a required length, which is typically 40-50 metres.
The initial thickness of the slab leaving the casting machine is substantially between 30 and 150 mm.
The invention arranges that a pendulous mechanical shears is used as a shearing assembly for slabs between 30 and 80 mm. thick, whereas for greater thicknesses the shearing assembly consists of an assembly of oxygen cutting lances.
An induction furnace suitable to restore the temperature of the slab quickly is included immediately downstream of the shearing assembly.
The slab at the inlet of the induction furnace has a speed of feed corresponding to the casting speed, typically about 3 to 6 metres per minute.
At this low speed of feed the restoration of the temperature of the slab is achieved with an induction furnace of a modest length, which employs induction powers that may reach 16-18 MW when the casting speed reaches 6 metres per minute.
In a first lay-out of the invention the induction furnace has substantially the task of heating the surface and edges of the slab and in that case is followed by a heating furnace.
According to another lay-out of the invention the induction furnace has the task also of heating the slab in depth and may be designed to work with different frequencies related specifically to the surface and core of of the slab.
According to a further lay-out the induction furnace comprises a plurality of modules, of which at least one heats the surface and edges and at least one heats the slab in depth.
A tunnel furnace is included downstream of the induction furnace and may have either the task of preventing any fall in the temperature of the slab and of keeping the temperature at the values of its departure from the induction furnace or the task of heating the slab to the desired temperature.
When the shearing of the slab is signalled, the segment of slab is accelerated by increasing the speed of the roller conveyors to reach a speed of 40 to 60 metres per minute or more.
The roller conveyors can be inside the tunnel furnace or be outside and be associated with insulating hoods possibly equipped with heating means.
The increase of speed on the roller conveyors enables the trailing end of the sheared segment of slab to be distanced from the leading end of the next slab being cast.
According to a first lay-out the segment of slab undergoes a descaling process downstream of the tunnel furnace on its path to the rolling train.
Further a descaling assembly is included upstream of the tunnel furnace and immediately downstream of the induction furnace so as to make maximum use of the effect of cracking of the scale caused by the heating of the surface of the slab.
The descaling assembly is advantageously of a type with movable nozzles to reduce to a minimum the lowering of the temperature of the slab passing at a low speed.
Moreover, the descaling assembly may also be governed advantageously by the signal of the shearing of the slab, for instance by following the gradient of acceleration of the conveyor rollers of the furnaces and by thus optimising its descaling action.
According to a variant the descaling assembly is of a type with stationary nozzles.
The descaling assembly with rotary nozzles is located advantageously downstream of the induction furnace, whereas the descaling assembly with stationary nozzles is positioned upstream of the rolling train and downstream of the tunnel furnace, whether the latter be a heating furnace or a temperature maintaining furnace.
According to another variant a descaling assembly, which is advantageously, but not necessarily, of a type with movable nozzles, is included within the secondary cooling chamber of the casting plant or immediately outside the mould.
According to a variant a slab storage and traversing furnace having also the task of heating is comprised downstream of the induction furnace and descaling assembly.
According to the invention this storage and traversing furnace includes means to displace slabs in a direction crosswise to their normal direction of feed.
The storage and traversing furnace may have the task of connecting together a continuous casting machine and a rolling train which are not in the same line as each other.
The storage and traversing furnace may also act as a buffer store and emergency store when any accidents, obstacles, operations of maintenance or replacement of rolls halt the rolling train while the casting machine continues working.
Moreover, the storage and traversing furnace can be associated with stores holding a cold charge and/or special products to be forwarded for rolling.
A further task of the storage and traversing furnace can be the alternative connection of two continuous casting machines with one single rolling train.
The storage and traversing furnace comprises also at least one feeder roller conveyor associated with the casting machine and also at least one removal roller conveyor associated with the rolling train.
The feeder and removal roller conveyors are outside the storage and traversing furnace and cooperate therewith transversely for the transfer of slabs thereinto and therefrom.
According to a variant the feeder and removal roller conveyors are inside the furnace and cooperate lengthwise with the furnace for the entry of slabs.
According to a variant the storage and traversing furnace comprises a zone in which it performs the task of a heating furnace. This zone is advantageously the zone cooperating with the removal roller conveyor.
The rolling assembly may be of a reversible type with a double rolling mill stand, the rolling rolls being adjustable according to the reduction of thickness desired.
When strip is being produced, the reversible rolling assembly cooperates upstream and downstream with a winding/unwinding means on which the strip is respectively wound and unwound on leaving the rolling mill stands so as to enable the direction of feed to be inverted with a saving of the space occupied.
The winding/unwinding means may be of a type providing heating for the wound package.
When sheet is being produced, the winding/unwinding means are disactuated.
When the required finished thickness has been reached, the strip or sheet is sent to a cooling assembly and is then discharged from the line.
When strip is being produced, a unit to form packages is included downstream of the cooling assembly.
According to a variant the rolling assembly is of a continuous type and consists of 3 to 7 rolling mill stands arranged in line.
The attached figures are given as a non-restrictive example and show some preferred lay-outs of the invention as follows:-
Fig.1
is a diagram of a strip production line according to the invention;
Fig.2
is the production line of Fig.1 as used for the production of sheet;
Fig.3
is a diagram of the method of working of the rolling assembly;
Fig.4
is a variant of the production line of Fig.2;
Figs.5a and 5b
show a variant of the production line of Fig.4 in two working steps;
Fig.6
is a plan view of a variant of the production line of Fig.4;
Fig.7
is a plan view of a variant of the production line of Fig.6.
The reference number 10 in the attached figures denotes a line to produce rolled products according to the invention.
Fig.1 shows in particular a line 10 suitable to produce strip, whereas Figs.2 and 4 shows the line 10 as adapted to produce thin sheet.
A thin slab 11 coming from a continuous casting machine 12 is sent to a shearing assembly 13 consisting, for instance, of a pendulous shears for shearing to size or a shearing assembly of oxygen cutting lances, depending on the thickness of the cast slab 11.
The shearing assembly 13 is of a known type and is synchronised with the casting speed.
The continuous casting machine 12 includes a usual ladle-overturning unit 25 and tundishes 26 of a replaceable type of the state of the art.
During the production cycle the shearing assembly 13 shears the thin slab 11 into segments of a desired length related to the weight of the finished coil, but typically segments 40 to 50 metres long. The shearing assembly 13 is also prepared for emergency scrap-shearing into short segments of a length between 200 and 450 mm. and for discharge of the same or for shearing to size in short segments of 3 to 4 metres during an emergency cycle in synchronisation with an emergency speed of the casting machine 12.
During the production cycle the segments are fed at the casting speed, which is typically a speed V1 of about 3 to 6 metres per minute, within an induction-type furnace 14.
By making use of the low speed of feed and the characteristics of the induction furnace 14, a modest power and a substantially short passage of the slab 11 within the induction furnace 14 are enough to raise the temperature of the slab 11. The induction furnace 14 typically has a length of 3 to 12 metres.
The induction furnace 14 employs also powers between about 3 and 8 MW for the slowest speeds of feed but may reach 16 to 18 MW for speeds of feed of about 6 metres per minute.
The induction furnace 14 has the task substantially of heating the surface and edges of the slab 11.
According to a variant an induction furnace 14 is included which has a length at least equal to that of the segment of slab 11 sheared to size and has the task of heating the slab 11 in depth.
According to another variant (Figs.5a and 5b) the induction furnace 14 consists of three modules positioned in sequence and consisting in this case of a stationary segment 14a, a traversable segment 14b and another stationary segment 14c for heating the surface and edges. The traversable segment 14b may be located, for instance, on a bogie cooperating with rails 23.
According to the invention a descaling assembly 115 is included at the outlet of the last segment 14c of the induction furnace 14 heating the surface and edges and cooperates with the slab 11 being fed at a low speed.
The descaling assembly 115 is advantageously of a type with rotary nozzles providing a high pressure of impact of about 7 to 9 kgs/cm2 and a low overall rate of flow of water of about 200-500 litres per minute so as to reduce to a minimum the drop in temperature of the slab 11 passing through at a low speed between 2.8 and 6 metres per minute.
During the normal production cycle the traversable segment 14b of the induction furnace 14 is installed on the same axis as the casting line and rolling train 17-117.
During an emergency cycle, when the shearing assembly 13 performs emergency shearing into lengths of 3 to 4 metres of slab, the traversable segment 14b is removed from the production line 10; to be more exact, in this case, when the signal has been given that the last production shearing has been performed and that the trailing end of the slab has entered the descaling assembly 115, the traversable segment 14b of the induction furnace 14 is removed from the line and replaced by a transfer means 22.
This transfer means 22 is suitable to collect the short slabs of 3-4 metres prepared by the shearing assembly 13 during the emergency cycle.
A tunnel furnace 16 is included downstream of the induction furnace 14 and may have the function of a heating furnace when the induction furnace 14 has only the task of heating the surface and edges.
Instead, the tunnel furnace 16 may have the function of a temperature maintaining furnace when it cooperates with an induction furnace 14 that heats the surface of the slab 11 and also heats the slab 11 in depth. In this case the tunnel furnace 16, possibly heated and/or insulated, arranges to prevent any drop in temperature of the material and maintains and keeps equal that temperature at about the values at the outlet of the induction furnace 14.
That temperature maintaining furnace or tunnel 16 is so dimensioned that it contains the whole length of the segment of slab 11.
As soon as the trailing end of the slab 11 leaves the induction furnace 14, the segment of slab is accelerated up to a speed V2 of about 60 metres a minute, undergoes descaling by the high-speed descaling assembly 15 and is sent to the rolling train 17-117.
According to a variant at least one emergency shears 24 advantageously of a hydraulic type is located between the tunnel furnace 16 and the descaling assembly 15.
According to the invention the high-speed descaling assembly 15 is advantageously of a type with static nozzles and obtains a pressure of impact of about 4.5 to 8.5 kgs/cm2.
According to a variant descaling assemblies 215 are included in direct cooperation with the secondary cooling chamber immediately downstream of the mould and possibly in cooperation with the base of the mould itself.
The variant shown in Figs.6 and 7 includes a storage and traversing furnace 27 downstream of the induction furnace 14. This storage and traversing furnace 27 cooperates with at least one feeder roller conveyor 28 associated with the casting machine 12 and at least one removal roller conveyor 29 associated with the rolling train 17.
In the lay-out of Fig.6 the storage and traversing furnace 27 has the task of connecting a casting machine 12 to a rolling train 17 which is not in-line with the casting machine 12.
The storage and traversing furnace 27 has the further function of a buffer store to collect segments of slab 11 whenever the rolling train 17-117 is halted owing to accidents, obstacles, operations of maintenance or replacement of rolls, etc.
The storage and traversing furnace 27 includes means to take slabs 11 from the feeder roller conveyor 28, transfer those slabs 11 crosswise to the normal direction of feed of the slabs 11 and place those slabs 11 on the removal roller conveyor 29.
These means to handle the slabs 11 within the storage and traversing furnace 27 are suitable to displace the slabs 11 transversely to the normal direction of feed of the slabs and are generally of a step-by-step known type.
According to the invention these handling means associated with the storage and traversing furnace 27 advantageously work in modest steps of the order of 500-600 mm. in displacing the slabs 11 within the storage and traversing furnace 27.
These handling means can also work with a greater step substantially equal to the width of the slab 11 in transferring the slab 11 from the feeder roller conveyor 28 and to the removal roller conveyor 29, the purpose of this being to carry out with one single displacement the taking of the slab 11 from the feeder roller conveyor 28 and the delivery of the same 11 to the removal roller conveyor 29.
In the lay-out of Fig.6 the feeder 28 and removal 29 roller conveyors are outside the storage and traversing furnace 27 and the introduction of the slab 11 into the storage and traversing furnace 27 takes place in a direction crosswise to the lengthwise axis of the slabs 11.
According to a variant of the invention the storage and traversing furnace 27 includes a first zone 127a associated with the feeder roller conveyor 28 and acting as buffer store and/or emergency store for the rolling train 17 and a second zone 127b associated with the removal roller conveyor 29 and used for heating the slabs which have to be forwarded for the rolling process.
According to another variant the storage and traversing furnace 27 cooperates with stores 30 which hold a cold charge and/or special products and which are associated with roller conveyors 31 that deliver into the furnace; these stores 30 may also act as emergency stores.
These stores 30 for a cold charge and/or special products may cooperate with units that perform conditioning, cropping of the leading and/or trailing ends, re-finishing and quick heating.
In the variant of Fig.7 the storage and traversing furnace 27 has the task of connecting two casting lines 33a and 33b respectively to one single rolling train 117.
In this case the storage and traversing furnace 27 is associated directly with a tunnel 116, which maintains the temperature of the slabs, possibly heats them and connects the side-by-side roller conveyors associated with the two casting lines 33a and 33b.
Each casting line 33a and 33b includes its relative induction furnace 14a and 14b and descaling assembly 15a and 15b.
The tunnel 116 includes transfer means 32 to transfer the slabs from one casting line 33 to the other.
This lay-out makes possible the alternative working of the two casting lines 33, which can feed the storage and traversing furnace 27 substantially continuously.
In the lay-out of Fig.7 the storage and traversing furnace 27 contains the feeder 128 and removal 129 roller conveyors within the furnace 27. The slabs 11 are fed into the furnace 27 along their normal axis of feed.
In the example of Figs.1, 2 and 6 the rolling assembly 17 is of a reversible two-stand type.
In a typical case of production of strip and/or sheet 111 with a finished thickness of about 1.5 to 2 mm. starting from a slab 11 cast with a thickness of about 50 mm., the sequence of reductions in the rolling assembly 17 is typically that shown in Fig.3.
The first pass in the first rolling mill stand 17a brings the slab 11a to a thickness of about 25 mm.; the next pass in the second stand 17b reduces that thickness of slab 11b to about 14 mm.
Where strip is being produced, the strip leaving the second stand 17b is wound in a roll on a second winding/unwinding unit 18 located downstream of the second stand 17b.
Thereafter the direction of feed of the strip/sheet is inverted for a second pass through the rolling mill assembly 17.
This second pass through the second stand 17b brings the thickness of the slab 11c to a value of about 9 mm., while the pass through the first stand 17a reduces this thickness of slab 11d to a value of about 5 mm.
Where strip is being produced, in this step the first winding/unwinding unit 18a located upstream of the first rolling mill stand 17a performs winding of the strip.
The winding/unwinding units 18a-18b cooperate with drawing units 21.
Where sheet is being produced, the winding/unwinding units 18 are excluded from the line and the whole length of the sheet is passed from one side to the other side of the rolling assembly 17.
The direction of feed is now inverted again for a third pass of the strip/sheet through the rolling assembly 17.
In particular, this third pass through the first stand 17a reduces the thickness of the strip/sheet 11e to about 3 mm. and the third pass through the second stand 17b brings the strip/sheet to the desired finished value of thickness of about 1.5 mm.
Lastly, the strip/sheet 111 is sent to a cooling assembly 19 and is then discharged from the line 10.
When strip is being produced, a strip coiling unit 20 to form coiled packages is included downstream of the cooling assembly 19.
According to the variant of Fig.4 the rolling assembly 117 is of a continuous type and comprises five rolling mill stands positioned in line.

Claims (21)

  1. Line to produce strip and/or sheet or a combined line for strip/sheet, starting from at least one plant for the continuous casting of thin or medium slabs, the continuous casting plant comprising in sequence a continuous casting machine (12), at least one assembly (13) for shearing to size, a temperature restoration system, a rolling train (17, 117) and a possible assembly (19) for the cooling of strip/sheet, means to accelerate the speed of feed of the slabs being included downstream of the assembly (13) for shearing to size, in which line the temperature-restoration system comprises an induction furnace (14) with at least one working frequency to heat the surface and edges of the slabs, the induction furnace (14) being followed by first descaling means and by a tunnel furnace (16), an emergency shears (24) and second descaling means being included between the tunnel furnace (16) and the rolling train (17, 117), the line being characterised in that the first descaling means are low-speed descaling means (115), while the second descaling means are high-speed descaling means (15).
  2. Line as in Claim 1, in which the low-speed descaling means (115) provide a pressure of impact of about 7-9 kgs/cm2 on the slab and an overall rate of flow of water of about 200-500 litres per minute.
  3. Line as in Claim 2, in which the low-speed descaling means (115) are of a type with rotary nozzles.
  4. Line as in any claim hereinbefore, in which the high-speed descaling means (15) provide a pressure of impact of about 4.5-8.5 kgs/cm2 on the slab.
  5. Line as in Claim 4, in which the high-speed descaling means (15) are of a type with static nozzles.
  6. Line as in any claim hereinbefore, in which the tunnel furnace comprises a storage and traversing furnace (27).
  7. Line as in any claim hereinbefore, in which the tunnel furnace comprises side-by-side roller conveyors associated with two casting lines (33a, 33b).
  8. Line as in Claim 7, which comprises means (32) to connect and to transfer slabs between the two side-by-side roller conveyors of the two casting lines (33a, 33b).
  9. Line as in any claim hereinbefore, in which the storage and traversing furnace (27) has outside itself at least one of the feeder (28) and removal (29) roller conveyors.
  10. Line as in any of Claims 1 to 8 inclusive, in which the storage and traversing furnace (27) contains within itself the feeder (128) and removal (129) roller conveyors.
  11. Line as in any claim hereinbefore, in which the storage and traversing furnace (27) contains at least one zone (127a) for the collection of slabs (11).
  12. Line as in any claim hereinbefore, in which the storage and traversing furnace (27) contains at least one zone (127b) for the heating of slabs (11).
  13. Line as in any claim hereinbefore, in which the storage and traversing furnace (27) is associated with stores (30) for a cold charge and/or special products.
  14. Line as in any claim hereinbefore, in which the storage and traversing furnace (27) connects a casting line to a rolling train (17, 117) positioned offset from that casting line (Fig.6).
  15. Line as in any of Claims 1 to 13 inclusive, in which the storage and traversing furnace (27) connects two casting lines (33a, 33b) to a rolling train (17, 117) positioned offset from those casting lines (Fig.7).
  16. Line as in any claim hereinbefore, which includes descaling assemblies (215) within the secondary cooling chamber, at least one of these descaling assemblies (215) being directly in cooperation with the base of the mould.
  17. Line as in any claim hereinbefore, in which the rolling assembly (17) is of a discontinuous type and consists of a reversible double stand (17a, 17b) with rolling rolls which can be adjusted on the basis of the reduction to be obtained, and cooperates with winding/unwinding means positioned upstream (18a) and downstream (18b).
  18. Line as in any of Claims 1 to 16 inclusive, in which the rolling assembly (117) is of a one-directional type and includes from 3 to 7 rolling mill stands positioned in-line.
  19. Line as in any claim hereinbefore, in which the induction furnace (14) is structured with a plurality of modules of which at least one (14c) performs heating of the edges of the slab.
  20. Line as in any claim hereinbefore, in which the induction furnace (14), or at least part thereof (14b), has a first in-line (10) and a second position removed from the line.
  21. Method to produce strip and/or sheet or combined strip/sheet starting from at least one plant for the continuous casting of thin or medium slabs, the continuous casting plant comprising in sequence a continuous casting machine (12), at least one shearing unit for shearing to size (13), a temperature restoration system, a rolling train (17, 117) and possibly a cooling unit to cool the strip/sheet (19), accelerating means to increase the speed of feed of the slabs being included downstream of the shearing unit shearing to size (13), in which method the temperature restoration system comprises an induction furnace (14) with at least one working frequency able to heat the surface and the edges of the slabs, the induction furnace (14) being followed by a first descaling means using water and by a tunnel furnace (16), there being included between the tunnel furnace (16) and the rolling train (17, 117) an emergency shears (24) and a second descaling means using water, in which the first descaling means using water (115), of the rotary nozzle type, cooperate with a slab travelling at a speed of between 2.8 and 6 metres per minute, and are made to work with the impact pressure of the water in the region of 7 to 9 kgs per cm2, and a total flow of water in the region of 200 to 500 litres per minute, while the second descaling means using water (15), of the static nozzle type, cooperate with a slab travelling at a speed in the region of 60 metres per minute and work at an impact pressure on the slab in the region of 4.5 to 8.5 kgs/cm2.
EP94105763A 1993-05-17 1994-04-14 Line to produce strip and/or sheet Revoked EP0625383B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITUD930086A IT1262118B (en) 1993-05-17 1993-05-17 Production line for strip and/or sheet
ITUD930086 1993-05-17
ITUD930215A IT1262224B (en) 1993-10-29 1993-10-29 Production line for strip and/or sheet
ITUD930215 1993-10-29

Publications (2)

Publication Number Publication Date
EP0625383A1 EP0625383A1 (en) 1994-11-23
EP0625383B1 true EP0625383B1 (en) 1998-02-25

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EP94105763A Revoked EP0625383B1 (en) 1993-05-17 1994-04-14 Line to produce strip and/or sheet

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US (1) US5542165A (en)
EP (1) EP0625383B1 (en)
CN (1) CN1104566A (en)
AT (1) ATE163370T1 (en)
BR (1) BR9401981A (en)
CA (1) CA2121556A1 (en)
DE (1) DE69408595T2 (en)
ES (1) ES2112440T3 (en)
RU (1) RU2114707C1 (en)
TW (1) TW262406B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
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DE102008047029A1 (en) 2008-09-13 2010-03-18 Sms Siemag Aktiengesellschaft descaling
CN101309763B (en) * 2005-12-22 2012-08-29 乔瓦尼·阿尔维迪 Method for producing band steel by continuous scheme and related apparatus
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Families Citing this family (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3063518B2 (en) * 1993-12-27 2000-07-12 株式会社日立製作所 Continuous casting device and continuous casting system
US5467519A (en) * 1994-01-10 1995-11-21 Tippins Incorporated Intermediate thickness twin slab caster and inline hot strip and plate line
TW336184B (en) * 1995-01-11 1998-07-11 Tippins Inc Intermediate thickness slab caster and inline hot strip and plate line, method of processing metal slabs and slab container
DE19529049C1 (en) * 1995-07-31 1997-03-20 Mannesmann Ag High-speed thin slab plant
DE19529046A1 (en) * 1995-07-31 1997-02-06 Mannesmann Ag Method and device for operating a continuous caster
DE19531538A1 (en) * 1995-08-25 1997-02-27 Schloemann Siemag Ag Hot strip production plant for ferritic rolling and method for producing ferritic rolled strip
DE19538341A1 (en) * 1995-09-06 1997-03-13 Schloemann Siemag Ag Hot strip production line for rolling thin rolled strip
IT1281442B1 (en) * 1995-10-27 1998-02-18 Danieli Off Mecc LAMINATION PROCESS FOR TAPES AND SHEETS AND LAMINATION LINE THAT CONCRETIZES THIS PROCEDURE
IT1288863B1 (en) * 1996-03-15 1998-09-25 Danieli Off Mecc CONTINUOUS LAMINATION PROCESS FOR SHEETS AND / OR TAPES AND RELATED CONTINUOUS ROLLING LINE
DE19621259A1 (en) * 1996-05-25 1997-11-27 Schloemann Siemag Ag Process and plant for the production of stainless steel or carbon steel sheet from thin slabs produced by continuous casting
US6089441A (en) 1996-06-28 2000-07-18 Nkk Corporation Method and apparatus for continuous rolling by welding the rolled materials at an intermediate stage of a rolling line
JPH105802A (en) * 1996-06-28 1998-01-13 Nkk Corp Welding type continuous rolling method and device therefor
DE19712212A1 (en) * 1997-03-24 1998-10-01 Schloemann Siemag Ag Process and plant for rolling out hot wide strip from continuously cast slabs
GB2327375A (en) * 1997-07-21 1999-01-27 Kvaerner Metals Cont Casting Continuous metal manufacturing method and apparatus therefore
US6120467A (en) * 1998-04-30 2000-09-19 Medtronic Inc. Spinal cord simulation systems with patient activity monitoring and therapy adjustments
DE10302265A1 (en) * 2003-01-22 2004-07-29 Sms Demag Ag Manufacture of continuously-cast steel slab, includes stage of high-energy deformation at high temperature to reduce depth of vibration markings in product
DE10357363B4 (en) * 2003-12-09 2006-02-09 Ispat Industries Ltd., Taluka-Pen Method and plant for casting and immediately subsequent rolling of casting strands of metal, in particular of steel materials, preferably thin strands
DE102004040927A1 (en) * 2004-08-24 2006-03-02 Sms Demag Ag Method and device for producing metal strips
ES2314642T3 (en) * 2005-04-07 2009-03-16 Giovanni Arvedi PROCESS AND SYSTEM FOR THE MANUFACTURE OF METAL BANDS AND SHEETS WITHOUT CONTINUITY SOLUTION BETWEEN THE FOUNDATION IN CONTINUOUS AND LAMINATING.
UA91564C2 (en) * 2005-12-16 2010-08-10 Смс Зимаг Акциенгезелльшафт method and device for producing metal strip
DE102006054932A1 (en) * 2005-12-16 2007-09-13 Sms Demag Ag Method and device for producing a metal strip by casting rolls
WO2007072516A1 (en) * 2005-12-22 2007-06-28 Giovanni Arvedi Process and related plant for producing steel strips with solution of continuity
DE102008063547A1 (en) * 2008-12-18 2010-07-01 Sms Siemag Aktiengesellschaft Method and device for descaling a metal strip
AT507663B1 (en) * 2009-04-09 2010-07-15 Siemens Vai Metals Tech Gmbh METHOD AND DEVICE FOR PREPARING HOT ROLLING MATERIAL
EP2258491A1 (en) 2009-06-04 2010-12-08 Siemens Aktiengesellschaft Rotation tool for a mill train and method for operating a casting-roller compound assembly
IT1405344B1 (en) * 2010-06-14 2014-01-03 Danieli Off Mecc LAMINATION LINE AND ITS PROCEDURE
IT1400629B1 (en) * 2010-06-22 2013-06-14 Danieli Off Mecc PROCEDURE AND PLANT FOR CASTING AND LAMINATION TO MAKE LONG METAL LAMINATE PRODUCTS
IT1400913B1 (en) * 2010-06-24 2013-07-02 Danieli Off Mecc PROCEDURE AND PLANT FOR CASTING AND LAMINATION TO MAKE LONG METAL LAMINATE PRODUCTS
IT1402239B1 (en) * 2010-07-21 2013-08-28 Danieli Off Mecc MAINTENANCE SYSTEM IN TEMPERATURE AND / OR POSSIBLE WARMING OF LONG METAL PRODUCTS AND ITS PROCEDURE
IT1402240B1 (en) * 2010-07-21 2013-08-28 Danieli Off Mecc MAINTENANCE EQUIPMENT IN TEMPERATURE AND / OR POSSIBLE WARMING OF LONG METAL PRODUCTS AND ITS PROCEDURE
IT1402238B1 (en) * 2010-07-21 2013-08-28 Danieli Off Mecc PROCEDURE AND PLANT FOR CASTING AND CONTINUOUS LAMINATION TO MAKE LONG METAL LAMINATE PRODUCTS
IT1404286B1 (en) * 2011-01-24 2013-11-15 Danieli Off Mecc LAMINATION PROCEDURE FOR RIBBONS AND ITS LAMINATION LINE
IT1403833B1 (en) * 2011-02-03 2013-10-31 Danieli Off Mecc LAMINATION PROCEDURE FOR RIBBONS AND ITS LAMINATION LINE
DE102012201418A1 (en) * 2012-02-01 2013-08-01 Sms Siemag Ag Steckel mill
EP2767600A1 (en) * 2013-02-15 2014-08-20 SMS Concast AG Method, especially for the production of long steel products and device for implementing the method
AT514079B1 (en) * 2013-05-21 2014-10-15 Siemens Vai Metals Tech Gmbh Method and device for rapid removal of heavy plates from a rolling mill
DE102013212951A1 (en) * 2013-07-03 2015-01-22 Sms Siemag Ag Casting rolling mill and method for producing metallic rolling stock
DE102013220657A1 (en) * 2013-07-26 2015-01-29 Sms Siemag Ag Method and device for producing a metallic strip in a continuous casting-rolling process
ITUD20130127A1 (en) * 2013-10-04 2015-04-05 Danieli Off Mecc STEEL PLANT FOR THE PRODUCTION OF LONG METAL PRODUCTS AND ITS PRODUCTION METHOD
CN103639708B (en) * 2013-11-20 2017-01-04 重庆环际低碳节能技术开发有限公司 Spiral band process equipment
DE102013224506A1 (en) * 2013-11-29 2015-06-03 Sms Siemag Ag Method and device for descaling a metallic surface and plant for producing metallic semi-finished products
KR101630911B1 (en) * 2013-12-26 2016-06-15 주식회사 포스코 continuous casting and rolling method
US10321524B2 (en) * 2014-01-17 2019-06-11 Nike, Inc. Conveyance curing system
US9725780B2 (en) 2014-06-13 2017-08-08 M3 Steel Tech Modular micro mill and method of manufacturing a steel long product
CN108057725B (en) * 2017-12-29 2020-03-27 南京钢铁股份有限公司 Control method of descaling system
RU2679159C1 (en) * 2018-03-07 2019-02-06 Акционерное общество "Выксунский металлургический завод" Method of manufacture of specially thin hot-rolled stripes on a wide-striped mill of the casting complex
IT201800004170A1 (en) * 2018-04-03 2019-10-03 CONTINUOUS CASTING AND LAMINATION PLANT FOR THE PRODUCTION OF METALLURGIC PRODUCTS
DE102018206343A1 (en) * 2018-04-25 2019-10-31 Volkswagen Aktiengesellschaft Process and plant for the mass production of hot formed sheet metal parts from a steel strip
DE102019207459A1 (en) * 2018-05-23 2019-11-28 Sms Group Gmbh Casting mill for batch and continuous operation
CN110038901B (en) * 2019-04-25 2024-02-23 中冶赛迪工程技术股份有限公司 Method and device for coiling, expanding and threading hot rolling longitudinal tangential line

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3610315A (en) * 1969-10-09 1971-10-05 Urban Reclamation Technologies Continuous steelmaking system and process
US4217095A (en) * 1977-05-23 1980-08-12 Tetsuya Tokitsu Reheating furnace for use in a hot rolling line
JPS57127505A (en) * 1981-01-22 1982-08-07 Nippon Steel Corp Direct rolling manufacturing device for steel
JPS59229268A (en) * 1983-06-08 1984-12-22 Nippon Steel Corp Descaling method of continuous casting billet
JPS6018201A (en) * 1983-07-11 1985-01-30 Nippon Kokan Kk <Nkk> Line of direct rolling equipment
JPS6096302A (en) * 1983-10-31 1985-05-29 Kawasaki Heavy Ind Ltd Rolling installation of steel bar
JPS6167549A (en) * 1984-09-11 1986-04-07 Nippon Kokan Kk <Nkk> Direct hot rolling method in continuous casting
DE3525457C3 (en) * 1985-07-17 1999-06-10 Mannesmann Ag Rolling mill for the production of hot-rolled steel strips
JPS6289501A (en) * 1985-10-14 1987-04-24 Nippon Kokan Kk <Nkk> Scale free casting and rolling installation
AU2669088A (en) * 1987-12-18 1989-06-22 Hitachi Limited Apparatus and method for hot-rolling slab into sheets
DE3821188A1 (en) * 1988-06-23 1989-12-28 Schloemann Siemag Ag BELT CASTING SYSTEM WITH TURN OVENS
IT1225544B (en) * 1988-07-26 1990-11-22 Danieli Off Mecc FLAT PRODUCTS LAMINATION PLANT
JPH084887B2 (en) * 1989-12-06 1996-01-24 株式会社日立製作所 High temperature cast carrier
FR2656553B1 (en) * 1990-01-03 1994-12-30 Stein Heurtey HEAT TREATMENT PLANT BEFORE LAMINATION OF THIN SLABS PRODUCED BY CONTINUOUS CASTING.
DE4017928A1 (en) * 1990-06-05 1991-12-12 Schloemann Siemag Ag METHOD AND SYSTEM FOR THE PRODUCTION OF HOT-ROLLED TAPES OR PROFILES FROM CONTINUOUSLY PRE-MATERIAL
EP0499851B2 (en) * 1991-02-19 2000-05-03 DANIELI &amp; C. OFFICINE MECCANICHE S.p.A. Tunnel system for a hot strip rolling mill linked to the continuous casting of thin slabs
DE4133898A1 (en) * 1991-10-10 1993-04-15 Eko Stahl Ag Hot rolled broad strip mfr. from continuously cast thin slab - with pressurised water applied to slab before entry into heating furnace
US5276952A (en) * 1992-05-12 1994-01-11 Tippins Incorporated Method and apparatus for intermediate thickness slab caster and inline hot strip and plate line
TW245661B (en) * 1993-01-29 1995-04-21 Hitachi Seisakusyo Kk

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101309763B (en) * 2005-12-22 2012-08-29 乔瓦尼·阿尔维迪 Method for producing band steel by continuous scheme and related apparatus
WO2007087886A1 (en) 2006-02-02 2007-08-09 Sms Demag Ag Method and casting/rolling plant for the production of hot-rolled metallic strips, especially steel strips, having great surface quality
DE102008047029A1 (en) 2008-09-13 2010-03-18 Sms Siemag Aktiengesellschaft descaling
DE102014224231A1 (en) 2014-01-03 2015-07-09 Sms Siemag Ag Method and device for producing a metallic strip in a continuous casting-rolling process
DE102016208114A1 (en) 2015-05-11 2016-11-17 Sms Group Gmbh Process for the production of a metallic strip in the cast rolling process
WO2016180882A1 (en) 2015-05-11 2016-11-17 Sms Group Gmbh Method for producing a metallic strip in a casting and rolling process

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CA2121556A1 (en) 1994-11-18
RU2114707C1 (en) 1998-07-10
TW262406B (en) 1995-11-11
DE69408595D1 (en) 1998-04-02
EP0625383A1 (en) 1994-11-23
CN1104566A (en) 1995-07-05
DE69408595T2 (en) 1998-10-15
US5542165A (en) 1996-08-06
ES2112440T3 (en) 1998-04-01
ATE163370T1 (en) 1998-03-15
BR9401981A (en) 1994-12-13

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